\begin{tikzpicture}[every node/.style={minimum size=1cm,draw}, >=Stealth]
    \foreach \text  [count=\i] in {
        $n$, 平方, $+n$, $\div n$, $- n$
    } {
        \pgfmathsetmacro{\x}{\i * 1.5}
        \draw (\x, 0) node {\text};
        \draw [->] (\x+.5, 0) -- (\x+1, 0);
    }
    \draw (9, 0) node {答案};
\end{tikzpicture}
